Support windsurf setups for coder extension

[amberry]

This brings supported list to be vscode, windsurf and cursor

Vscode and cursor can install the ms remote extension, and so the extensionpack entry triggers that.

The ms remote ssh extension is not available for the gallery that windsurf has, so that dep becomes invisible there, and then the activation code does the right thing for Windsurf, using its built in remote support.

Tabling vscodium support for now, had some issues (hanging on attempting to start the remote) I didn't get to the bottom of between this coder extension and https://open-vsx.org/extension/jeanp413/open-remote-ssh.

Addresses #408

[matifali]

Hi @amberry, with the previous information and my testing.

Windsurf

Works without any issues.

VSCodium

Works if jeanp413.open-remote-ssh is pre-installed and we launch from URI, i.e., vscodium://...
But can not render the Coder extension views

Also, manual login from the Coder extension gives
`command 'coder.login' not found

Cursor

The cursor only works if the remote-ssh extension is pre-installed. The coder extension now does not prompt you to install it.

[amberry]

@matifali Yep, I updated the description to state that windsurf, vscode and cursor do work.

Now, re cursor. If you installed a locally built vsix package, then the extensionpack deps don't get installed, thats a platform limitation.

Once built and hosted on a marketplace the extensionpack deps will come through, and I did check that with a marketplace running locally (I have one because of other work I'm doing). If they are valid for the marketplace gallery defined, you'll see them on the extension pack tab above ^.

[matifali]

Tabling vscodium support for now, had some issues (hanging on attempting to start the remote) I didn't get to the bottom of between this coder extension and open-vsx.org/extension/jeanp413/open-remote-ssh.

For me, VSCodium works fine if https://open-vsx.org/extension/jeanp413/open-remote-ssh is installed. I am fine if we consider that as a separate PR.

[matifali]

Thanks @amberry
I will leave the final approval for @bcpeinhardt.